Facebook canvas app unable to get access token using PHP SDK -

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good noon,

i trying create new facebook canvas app. facebook app tried access token getcanvashelper() method, every time tried print shows blank. using php sdk 5.0.0 

$helper = $fb->getcanvashelper(); $accesstoken = $helper->getaccesstoken();

here below full sample code. due access token issue unable process further.

any appreciable.

here below sample code. 

<?php session_start();  require_once __dir__ . '/src/facebook/autoload.php';  $fb = new facebook\facebook([   'app_id' => 'my_app_id_i_have_replce_it_for_security',   'app_secret' => 'my_app_secret_i_have_replce_it_for_security',   'default_graph_version' => 'v2.4', ]);  $helper = $fb->getcanvashelper();  $permissions = ['user_posts']; // optionnal  try {     if (isset($_session['facebook_access_token'])) {     $accesstoken = $_session['facebook_access_token'];     } else {         $accesstoken = $helper->getaccesstoken();      } } catch(facebook\exceptions\facebookresponseexception $e) {     // when graph returns error     echo 'graph returned error: ' . $e->getmessage();     exit; } catch(facebook\exceptions\facebooksdkexception $e) {     // when validation fails or other local issues     echo 'facebook sdk returned error: ' . $e->getmessage();     exit;  }  if (isset($accesstoken)) {      if (isset($_session['facebook_access_token'])) {         $fb->setdefaultaccesstoken($_session['facebook_access_token']);     } else {         $_session['facebook_access_token'] = (string) $accesstoken;          // oauth 2.0 client handler         $oauth2client = $fb->getoauth2client();          // exchanges short-lived access token long-lived 1         $longlivedaccesstoken = $oauth2client->getlonglivedaccesstoken($_session['facebook_access_token']);          $_session['facebook_access_token'] = (string) $longlivedaccesstoken;          $fb->setdefaultaccesstoken($_session['facebook_access_token']);     }      // validating access token     try {         $request = $fb->get('/me');     } catch(facebook\exceptions\facebookresponseexception $e) {         // when graph returns error         if ($e->getcode() == 190) {             unset($_session['facebook_access_token']);             $helper = $fb->getredirectloginhelper();             $loginurl = $helper->getloginurl('https://apps.facebook.com/bs-kapil-canvas/', $permissions);             echo "<script>window.top.location.href='".$loginurl."'</script>";             exit;         }     } catch(facebook\exceptions\facebooksdkexception $e) {         // when validation fails or other local issues         echo 'facebook sdk returned error: ' . $e->getmessage();         exit;     }      // getting posts published user     try {         $posts_request = $fb->get('/me/posts?limit=500');     } catch(facebook\exceptions\facebookresponseexception $e) {         // when graph returns error         echo 'graph returned error: ' . $e->getmessage();         exit;     } catch(facebook\exceptions\facebooksdkexception $e) {         // when validation fails or other local issues         echo 'facebook sdk returned error: ' . $e->getmessage();         exit;     }      $total_posts = array();     $posts_response = $posts_request->getgraphedge();     if($fb->next($posts_response)) {         $response_array = $posts_response->asarray();         $total_posts = array_merge($total_posts, $response_array);         while ($posts_response = $fb->next($posts_response)) {               $response_array = $posts_response->asarray();             $total_posts = array_merge($total_posts, $response_array);           }         print_r($total_posts);     } else {         $posts_response = $posts_request->getgraphedge()->asarray();         print_r($posts_response);     }      // can redirect page , use access token $_session['facebook_access_token'] } else {     $helper = $fb->getredirectloginhelper();     $loginurl = $helper->getloginurl('https://apps.facebook.com/bs-kapil-canvas/', $permissions);     echo "<script>window.top.location.href='".$loginurl."'</script>"; }


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